Final answer:
Coal gas is a non-renewable energy source derived from underground hydrocarbons that will eventually run out and releases CO2 when burnt.
Explanation:
Coal gas is not an exhaustible source of energy as it is a non-renewable resource derived from underground hydrocarbons. Fossil fuels, including coal gas, are formed over millions of years and will eventually run out. Burning coal gas releases large amounts of pollution, particularly the greenhouse gas CO2.
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